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The change came not long after Dick’s Sporting Goods announced it would take assault-style rifles out of its stores and raise its age limit for purchasing guns to 21 as well.

Read the full statement below:

In light of recent events, we’ve taken an opportunity to review our policy on firearm sales. Going forward, we are raising the age restriction for purchase of firearms and ammunition to 21 years of age. We will update our processes as quickly as possible to implement this change.

In 2015, Walmart ended sales of modern sporting rifles, including the AR-15. We also do not sell handguns, except in Alaska where we feel we should continue to offer them to our customers. Additionally, we do not sell bump stocks, high-capacity magazines and similar accessories. We have a process to monitor our eCommerce marketplace and ensure our policies are applied.

We take seriously our obligation to be a responsible seller of firearms and go beyond Federal law by requiring customers to pass a background check before purchasing any firearm. The law would allow the sale of a firearm if no response to a background check request has been received within three business days, but our policy prohibits the sale until an approval is given.

We are also removing items from our website resembling assault-style rifles, including nonlethal airsoft guns and toys. Our heritage as a company has always been in serving sportsmen and hunters, and we will continue to do so in a responsible way.

Walmart said its decision came after the company reviewed its firearm sales policy in light of the mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, that killed 17 people. The teenage gunman used an AR-15 rifle. It said it takes "seriously our obligation to be a responsible seller of firearms" and also emphasized its background of serving "serving sportsmen and hunters."

Several major corporations, including MetLife, Hertz and Delta Air Lines, have cut ties with the NRA since the Florida tragedy, but none were retailers that sold guns. The NRA has pushed back aggressively against calls for raising age limits for guns or restricting the sale of assault-style weapons.

Walmart Inc. stopped selling AR-15 guns and other semi-automatic weapons in 2015. It doesn't sell bump stocks, the accessory attached to a semi-automatic gun that makes it easier to fire rounds faster. It also doesn't sell large-capacity magazines. It also says it doesn't sell handguns, except in Alaska.

In announcing the change in policy, the company said it had processes in place to make sure it was applied for online sales.